[Bug 1929449] Re: do not allow upgrades to hirsute for Apple hardware

[Justin "J" Lynn]

> I can confirm that this quirk disables upgrades on OpenPOWER hardware
(which is not EFI based). Tested with OpenPOWER/Raptor Computing Systems
Talos II on groovy.

Please note that OpenPOWER systems do not support DMI. OPAL provides
platform metadata in sysfs (platform, vendor make/model and version
information can be found under /sys/firmware/devicetree/base/{vendor
,model-name,model}).

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https://bugs.launchpad.net/bugs/1929449

Title:
  do not allow upgrades to hirsute for Apple hardware

Status in ubuntu-release-upgrader package in Ubuntu:
  Fix Released
Status in ubuntu-release-upgrader source package in Hirsute:
  Fix Released

Bug description:
  Due to LP: #1928434 release upgrades to Hirsute are not currently
  enabled for any one. However, the release upgrade process is safe for
  most systems so we should create a distribution upgrade quirk which
  prevents upgrades to Hirsute which is hardware specific.

  [Test Case]
  1) On Apple hardware running Ubuntu 20.10 download the release-upgrader tarball from -proposed (http://archive.ubuntu.com/ubuntu/dists/hirsute-proposed/main/dist-upgrader-all/current/hirsute.tar.gz) [This is necessary because upgrades to hirsute aren't enabled yet.]
  2) Extract the tarball
  3) Run './hirsute --frontend DistUpgradeViewGtk3'
  4) Observe a message regarding upgrades not being enabled for Apple hardware and the upgrade exit
  5) Run './hirsute --frontend DistUpgradeViewText' and ensure the same message appears.

  This should also be tested on not Apple hardware to ensure that
  upgrades can proceed for those systems.

  [Where Problems Could Occur]
  The _test_and_fail_on_apple() also will prevent upgrades for systems where /sys/lcass/dmi/id/sys_vendor does not exist which is a new situation. However, until the shim bug is resolved that seems like the safest option for users. After the shim bug is resolved we'll disable this specific quirk.

  Additionally, if the quirk is poorly written it could disallow all
  upgrades but we are testing for this by testing it on non-Apple
  hardware.

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